Collar splitter



P. YUNGLING COLLAR SPLITTER Feb. 3, 1931.

' 2 Sheets-Sheet 1 Filed May 29. 1.929

INV ENTOR. Paa/ Yufly/my A TTORNEYS FP'QUNITED STATES PATENT PAUL YUNGLING, or LOS ANGELEs, cALIroRNrA COLLAR srLr'r'rEn Application filed May 29, 1929;; "serial-No. 366,907. p I

This invention relatesvtoa device in thev initial position splitting a collar; Fig. 2 is nature'of an overshot which may be operated a section'as seen on the line 2-2 of Fig. 1; by an upward pullto engage a cylindrical Fig. 3 is a view similar to Fig. 1 showing strin such as a tubing stringu vA more a fragment 'of the tool as selenvon the line o'specihc form of the invention appertains to ofFig. 1; Fig. 4 is alview similar to a device as above described which maybe Fig. 3 showing the gash' or' cut Jopened by': operated to split collars which serve as couthe piercing dogs, the tool having been ad plings between adjoining sections of a tuvanced to its final position before stripping bular string, such as well casing, drill pipe .occurs; Fig.6 shows side and front elevations 10 and the like. Hereinafter, the term tubing of a pi'ercing'dog; Fig. 6 isiavverticalsection is used in the broad sense to include well casshowing details of the mounting of a, piercing, drill pipes and any'equivalent cylindrical ing dog; Fig. shows aside and front elevastring. It is desirable in oil well work to cut tionof a stripping dog; Fig. 8 is a'perspective ofi sections ofatubular string when the latter view of a wedge block for supporting the is in the well ho1e,'especially when the string gashing cutters. y Y I i '2 j is stuck or frozen in the hole. By parting Referring more particularly to Figs. 31 to V the string at a collar, the upper section may 8 inclusive, of-the drawings, A indicates a be removed. It is therefore advantageous to string of drill pipe havinga coupling collar provide a tool which may be positioned at a (1. Disposed over the, drill pipe string is'a selected collar and is operable to split the tubular operating'stringB hereafter deferred ,5

latter so as to 'releasethejoints of tubing to as the tool or fishing string] Attached to coupled thereby. the toolstring isa-body'C carrying a ga'shing The objects of this invention are: first, to ean indi ated gen rally by J);- -Piereing provide a device which may be slipped over a mechanism i i dicated generally by E and 25 stringof tubing and loweredtoa selected stripping means by F. I position ,and' then upon elevation'willcon Th body comprisesan adapter collar 15 .7 .7

tact with the tubing; second, to provide a having a seat 16 for a-spring, Attached'to device which may be sllpp d v r g oi the collar 15 is a cylindrical shell 17 having tubing and lowered to a selected position and a t e d intermediate portion 18 provided 3 then upon elevation will contact with the with a seating shoulder 19. Below; the tag; Second, to P deuce WhlCh pered portion the bore of the shell is of inmay be slipped over the string of tublng an creased diameter and attached .to the bottom lo to a l ll h y ah hp is an adapter collar 20 providing a shoulder f Ward. pull-sp the d, to P V 21. The collars 15 and 20 are internally a tool which will first cut the collar and there thre d d"t d pt th t0 iv t bi th v I uP011 p the cuts) made; fourth op "tool string B being connected. to the col: vide a tool which will obtain a hold upon the 1 1-5. 1 V V v parted h h so as strip the 601131" from Mounted within the body at 'the tapered the lower-101M015 t-llhlhg; and fifth, to P surface 18 are ring segments 22m and 22b,

Vide a Splitter I which p their adjacent ends being spaced to define 9c 4 ng and is pe a W a minimum of .slidefways forwedge blocks. Theringsare applied force. shown secured to the shell by means of Ina- These Objects togetheh with other je chine screws 23. Slidably mounted in the 1 h Corresponding m i m n are 9 ways are wedge blocks 24a and 24b. The tainedby mean Of embodlments of my wedge blocks haveinclinedfaces correspond 1118792517011 h f 111 e mp y ing to the-tapered surface 18 so as to ride drawlngs' 1n wh1ch:- V V thereon, Theiinner faces of the wedgeblocks' 1 15 an 3x131 Sectloll through a 1 are recessed and j ournalled therein are gashsplitter showing a tubing stri g in eleva ing roller cutters 25a and 256.: Retaining .tion, the operatingparts being shown in their blocks. 26a and 26b form'part of the wedge diametrically opposite pairsbeing in registration with the gashing rollers. A bearing member 31 is secured in position between each,

pair of the cars by a dowel pin to define a rounded beari'ng'surface forpiercing dogs 32 to-th'rust against. The dogs arepivotally retained' on the ears by means of screws 33. Each piercing dog has a point 34 and an outer; cutting edge 35. The points of the piercing dogs are disposed'below the gashing rollers a distance equal to about one half the lengthof a collar a. A stop shoulder 36 is-provided on each dog to limit its inward swinging movement. Leaf springs 37 secured to the dogs engage the shell and tend to maintain the piercing dogs in their innermostposit-ion.

Between each pair of ears 30, at 90 to the gashing rollers, are stripper dogs-39, supported on bearing blocks and retained'by screws in the samemanner as piercing dogs 32. Dogs 39 have'lifting shoulders 40 for engaging the under edge of a collar,-the shoulders being disposed below the points of the'piercing dogs. The stripper dogs are urged to swing-inwardly by leaf springs 41, a stop shoulder 40" being provided on each dog to limit its inward swinging movement.

iVith the parts assembled as shown in Fig. 1, the splitter is placed over the drill pipe 7 to be parted and lowered to the collar to be of the cut and the pipe.

split. Lowering is effected by means of the tool string B. As the splitter passes down wardly, the dogs ride over the collars but are maintained in contact with the drill pipe string. The gashing rollers are maintained in contact with the drill pipe string and will ride freely over the collars, as the wedge blocksgmay be I moved upwardly against the action of compression spring 27 and thereby outwardly for the rollers to clear the collars; When the tool has been positionedwith the gushing cutters below the collar to be split, the splitter is pulled upwardly, the wedge blocks being forced into their lower positions by the. upward drag and the cutters into the collars causingithem to gash the collar as indicated by 42in Fig. .3. After about one half'of the collar has been gashed or cut,'the piercing dogs 32 enter'between the bottom A further pull causes the stripper dogs to engage the lower edge of the collar and the piercing dogs to split it. Further pulling spreads the collar,

1. A collar splitter for tubular strings comprising a hollow body adapted'to be slipped-over'a tubing string, gashingmembers having cutters movably mounted in said body, means to cause said cutters to be projectedinwardly'against the string upon upward movement of the body in relation to the string, and piercing dogs pivotallymounted on said body belowsaid cutters and in alignment therewith, said dogs-being urged inwardly toward. the string; Y

2. A collar splitter. for. tubular strings comprising. a hollow body adapted to' be slipped over a tubing string, wedge members movably mounted on said body so as to be caused to be moved inwardly toward the string to be cut'upon upward mOVGIIiQIltL'Of' said body in relation tolsaid Wedge members, gas'hing cutters mounted on said wedge members, and piercing dogs pivotally mounted on said body below said cutters and in alignment therewith, said dogs being urged inwardly toward'the string.

3.-A collar splitter forJtub-ular J strings comprising a hollow body adapted to. be slipped over a tubing string, wedge membersmovably mounted on said body so as to be caused to be; moved inwardly toward the string to be cut upon upward movement of said body in relation to said wedge members, gashing cuttersmounted on said Wedge members. resilient means tending to move said wedge members downwardly in said body, and piercing dogs pivotally mounted on said body below said cutters-and in alignment therewith, said dogs being urged inwardly toward thestring.-: 1

4. A collar splitter for tubular strings comprising a hollow body adapted to be slipped over a tubing string, saidbody having an inclined surface converging downwardly and inwardly, wedge blocks slidable on said surface, gashing cutters on said wedge blocks, and piercing dogs pivotally mounted on said body below said cutters and in alignment therewith, said dogs being urged inwardly toward the string.

5. A collar splitter'fortubular strings com- I prising a hollow body adapted to be slipped over a tubing string, said body having an inclined surface converging downwardly and inwardly, wedge blocks slidable on said surface, gashi'ng cutters on said wedge blocks,

resilient means tending to move said blocks downwardly with relation to saidbody, and

piercing dogs'pivotally mounted on said body below said cutters and in alignment therewith, said dogs being urged inwardly toward the string.

6. A collar splitter for tubular strings comprising a hollow body adapted to be slipped over a tubing string, said body having .an inwardly extending spring seat at the upper end of its bore, inwardly extending blocks seats spaced below said spring seats, an in clined surface intermediate said seats. converging downwardly and inwardly, wedge block members mounted on said surfaces, cutters on said wedge blocks, a compression spring disposed between said wedge blocks and said spring seat, and piercing dogs pivotally mounted on said body below said cut-, ters and in alignment therewith, said dogs being urged inwardly toward the string.

7. A collar splitter for tubular strings com prising a hollow body adapted to be slipped said body at their lower ends below said cutters and in alignment therewith, springs urging said dogs inwardly toward the tubular string, and stripper dogs pivotally mounted on said body and having lifting shoulders disposed below the active'ends of said piercing dogs, said stripper dogs being urged toward said string. a Y

In witness that I claim the'foreg'oing I have I hereunto subscribed my name this 10th day of May, 1929.

, Y PAUL YUNGLING.

over a tubing string, gashing members hav-j 1 ing cutters movably mounted in said body,

means to cause said cutters to be vprojected inwardly against the string upon upward movement of the body in relation to the g string, piercing dogs pivotally mounted on string, piercing dogs pivotally mounted on said body below said cutters and in alignment therewith, said dogs being urged inwardly toward the string, and stripper dogs having lifting shoulders mounted on said body and laterally movable inwardly toward said string, said shoulders being disposed below the active ends of said piercing dogs.

9. A collar splitter for tubular strings comprising a hollow body adapted to be slipped over a tubing string, gashing members having cutters movably mounted in said body, means to cause said cutters to be projected inwardly against the string upon upward movement of the body in relation to the string, piercing members mounted on said body below said gashing members in alignment with said cutters to engage and open the cuts made by said cutters, and stri per dogs having liftin'g shoulders mounte on said 1 body and laterally movable inwardly toward said string, said shoulders being disposed below the active ends of said piercing dogs.

10. A collar splitter for tubular strings comprising a hollow body adapted to he slipped over a tubing string, gashing members having cutters movably mounted in said body, means to cause said cutters to be projected inwardly a ainst the string upon uprward movement 0 the body in relation to the string, piercing dogs pivotally mounted on I 

